Apparatus for dishwashing



2 Sheets-Sheet Dec. 6, 1932. E. GREENE ET AL APPARATUS FOR DISHWASHING Original Filed Nov. 21. 92

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' Dec. 6, 1932.

APPARATUS FOR DI SHWASHING E. GREENE E'II AL 9 358 Original Filed Nov. 21. 1927 2 Sheets-Sheet '2 avwewtou z Edyezdazfi Q'eezze liailstll H Salaam/0 11 Patented Dec. 6, 1932 UNITED STATES nnonwou'rr: GREENE AND WAITSTILL H.

SWENARTON', 0F MONTOLAIR, NEW JERSEY APPARATUS FOR DISHWASHING Original application filed November 21, 1927, Serial a. 234,888, now Patent No. 1,794,169, dated February 24,

1931. Divided and this application This invention relates to electrical dishwashing machines and has for its principal objects the provision of a sturdy and eflicient domestic machine adapted-to operate on the ordinary lighting circuit, which machine is so constructed that it is possible to utilize an extremely small pump unit and yet obtain a thorough drenching of all of the utensils to bewashed in said dishwasher with high pressure sprays of extensive area discharged in orderly succession upon the utensils while preventing deleterious pressure developing in the system during the transition period and which machine is furthermore virtually self-cleansing and therefore easily maintained in a sanitary condition.

Our investigations have led to the discovery that the effective utilization of a small power unit in a circulatory system of a dishwasher including a pressure unit as a part" thereof .requires the provision of a plurality of groups of outlets discharging into the washing chamber, the total area of the orifices of which outlets is considerably in excess of the eifective maximum inlet area of a pump unit capable of operating efiiciently under the high pressures desired, and the association with such groups of outlet apertures of a specific valve mechanism which, while. ca pable of periodically diverting the flowof water from a pump unit employed from one group of nozzles to another group or groups, is provided with pressure equalizing means for preventing the building up of excessive and deleterious pressure in the system during the period of shifting the flow of water from one group of outlet apertures to another.

In the accompanying drawings forming a part of the specification we have disclosed a preferred embodiment of our invention merely as illustrative thereof, though we do not intend that the scope of the appended claims should be limited merely to an embodiment as herein disclosed.

Referring to the drawingsi- I Figure 1 is an elevation partially broken away of a dishwasher our invention;

Fig. 2 is a horizontal section on the line of Fig.1; and

filed July 5, 1929. Serial No. 375,947.

' Fig. 3 is a vertical section on of Fig. 2. 7

Referring to the construction shown in these drawings, the reference numeral 1 designates a tank of Monel'metal or other suitable material of the desired capacity which is mounted on suitable legs 2 thatare interconnected by braces 3 which carry the motor and pump units and also the bearings for the sliafting. A spider: member 4 which is adapted 'to receive dish carriers or basket the line 3-3 members 5, 5' is mounted on a vertical shaft 6,

cored to provide ducts 21, 22 and 23, whereby water entering from the conduit 16 can pass elther into duct 21, or pass through duct 22 into an intersecting vertical discharge ductj24, and fresh rinse. water can be introduced into the chamber 15 through duct 23 from a similarvertical rinse water duct (not shown) such as shown in the construction employed in Patent No. 1,672,286 dated June 5th, 1928, the application for which patent was co-pending with our application No. 234,888 which matured into atent-No. 1,794,169, of which latter applicationthis is a division. a

Such vertical ducts extend upwardl through said casting to the top at w-hic point the same may be provided with suiting slotted head serves to by-pass part of the water during the transition period through the next successive port which com- 'municates with a different group of discharge apertures, the slot in said head being of just sufficient, length to gradually uncover the next successive port as the previous port is being covered and thereby prevent any building up of excessive pressure in the system withoutrequiring the employment of an{% relief valve. Accordingly, no claim of su cient scope is made herein to include such prior and different disclosure of said application respecting the prevention of any accumulation ofpressure in the system.

In the cam and tappet valve construction for controlling the passage of water from the distributor chamber-into the ports a, b and c, a cam member is pinned or otherwise secured to a sleeve 46 that projects into the stufling box 47, said cam comprising an elevated face is and a lower face Z, these.

faces being interconnected by sloping or inclined faces "m and n respectively. The

' length of the elevated face k when supplemented by the length of-one of the inclined faces m or n is 120 around the circumfer ence of the cam 45, so that as hereinafter explained, during the rotation of said cam 45 'tappet' valves 50, 51 and 52,'mounted on stems 59, 'will be respectively caused to remain 0 n in orderly succession during a third of a revolution and be closed during two-thirds of a revolution of said cam. These tappet valves are adapted to seat respectively on valve-seats53, 54 and 55 and are normally held in a closed position by springs 56. The stemsof the valves are mounted on arms 57 carried by a spider 58, said spider being pro- Vided with lugs 57', whereby the spider can be conveniently secured to the inner vertical wall of the distributor chamber circumferentially of the stem 34". Said stems 59 each are adapted to extend through a boss or journal 60 that is'in splined engagement therewith, whereby longitudinal movement of the stems is permitted while the rotation thereof is' prevented. On the ends of the stems 59 of these tappet valves are provided I shoes 61, 62 and 63 respectively, whlch shoes are adapted to ride on the aforesaid faces of the member 45. When the cam 45 is in the'position shown in Figs. 2 and 3, the tappet valve 52 will be raised entirely off its seat, while the other two tappet valves will be seated, consequently water entering the distributor chamber through the inlet port can only escape therefrom through the duct 0.

Intermeshing bevel gears 64 .and 64'- are pinned or otherwise secured to the shaft 6 and to the stem 34" respectively only in the event it is desired to have. the member 45 in continuous rotation, but otherwise a similar pin-gear construction to that shown in 2 and 4 of said Patent No. 1,794,169

to hold oneof the tappet valves off its seat for a predetermined length of time in order to maintain the flow of waterthrough any desired one of the ducts a, b or c.

Preferably, in order to take up the thrust imparted through the gear to theshaft, an

adjustable stop or finger 66 is secured to the casting w. Said finger is adapted to travel in a peripheral groove 67 formed in the knob 37 which latter is pinned to the stem 34'. A bushing 68 and stufling box 69 are provided to prevent leakage of water from the distributor chamber through the casting m.

A spring 70, which is stronger than the combined strength of any two of the springs 56, serves to hold the cam 45 in the position shown in Fig. 2, whereby the sleeve 46 is normally maintained in operative relation with the stem 34". Preferably the said sleeve 58 and the tappet valves and stems associated'therewith and the shoes carried thereby comprise a unit which can be readily fitted upon the hollow shaft 46 and thus the same may be readily removed for regrinding operations when and as desired.

Among the advantages of the construction herein shown may be mentioned the fact that this construction like that dislosed in the aforesaid Patent N o. 1,672,286, permits of the employment of such a small pump unit that the same can be operated by a small electric motor such as is adaptable and permissible for use on the ordinary house lighting circuit, as not only is the water so utilized that in spite of the relatively small capacity of the pump (usually. some 3 to 4 gals. per minute), a thorough drenching and thorough cleansing of the utensils is obtained, but the starting torque of the pump and the rotatable dish carrier geared therewith is so low that there is little dan er of the apparatus stalling and causing t e blowing of the fuse in the circuit or injury to the windings of the motor. Furthermore, and this is of no little consequence, the employment of a small pump in the construction herein described requires a minimum quantity of water, about 1 or 2 qts. being necessary for maintaining effect ve spraying of the dishes when utilizing a domestic dishwasher of the standard size, such as employed by the average family. Consequently, the expense and difficulty of securing large quantities of hot water for the washing and rinsing operations are eliminated. Likewise, the employment of such a small quantity of water in turn requires but an extremely small quantity of soap, as in dishwashing operations wherein the amount of dbris is relatively small, it is the percentage of the composed, rather than the additional quantity of soap employed regardless of the water, which determines the eifectiveness of the soap solution for washing purposes.

Vhile we have shown several preferred embodiments of our invention, we wish to be understood that the same are merely illuss trative of our invention and that any construction within the scope of the appended claims is within the spirit of our invention. Aswill be apparent from the construction herein described, no equalizing or pressure relief .valve, such as is provided in the modified construction shown in our aforesaid Patent No. 1,794,169, is required, since as the cam member rotates, one' of the valves will either be entirely open or entirely closed, or but partially open or but partially closed, depending upon whether its respective shoe is riding along the elevated face is, the lower face I or the inclined faces m or 'n of the cam. At such times, if one valve is partially open, one. of the other valves will also be partially open since the total length of one of the inclined faces m and n plus the length of the face Z: is equal to 120 along the periphery of the cam 45, and the extent to which one valve is opened when riding on an inclined A face an or n is supplemented by the extent an adjacent valve is opened when riding along the opposing inclined face, being just enough to provide at all times a discharge equivalent to the full discharge through one. ofsaid valve control ports when the valve controlling the same is completely open.

Having thus described our invention, what we claim and desire to obtain by United States Letters Patent is:

1. In a dishwasher in which a small volume of water is distributed in orderly succession.

through a plurality of groups of spraying means, the combination of a distributor chamber provided with a plurality of outlet ports, a plurality of groups of spraying means, each of said groups being in communication with a different one of said outlet ports, means for connecting said distributor chamber in communication therewith and having a plurality of discharge ports, means including a cam and associated springpressed tappet valves for effecting the discharge of water from the source of supply through diiferent ports in orderlysuccession while preventing the accumulation of deleterious pressure in the system during the transition period of shifting the flow of water from one port through another, a sleeve secured to said cam and extending outwardly therefrom, means for operating said cam, including a rod which pro3ects through said sleeve and driving means operatively connected to said rod, said sleeve and said rod having a slot and pin connection whereby said sleeve is operatively connected to said rod and the latteris nioveable to be operatively 1iisconnected from said driving means at wil v 3. In a dishwasher, the combination comprising a plurality of groups of spraying means, a source of water under high pressure, a plurality of conduits each in communication with a different group of such spraying means, cam means and associated tappet valves for eifecting the discharge of water, which has been delivered under high pressure from" said source of supply, through the different conduits aforesaid in orderly succession and for preventing the accumulation of deleterious pressure in the system during the transition period of shifting the flow of water from one conduit to another, the cam having an operating face of such a configuration and length that the valve through which water is discharging does not close prior to the opening of another of said valves.

Signed at New York, in the county and State of New York, this 3rd day of July EDGEWORTH GREENE. W-AITSTILL H. SWENARTON.

chamber with a source of water under high pressure, a plurality of spring-pressed tappet valves, each valve controlling a different one of said outlet ports, a cam-engaging shoe mounted on the stem of each ,tappet valve and a common cam having-a face which is disposed so as to be in continuous contact with a shoe when its respective valve is open, and which face is of such a configuration and length as to continually maintain a discharge of water from the distributor chamber which is substantially equal to the full discharge area of at least one of said ports.

9.. In a dishwasher in which a small volume of water is distributed in orderly succession through a plurality of groups of spraying means, the combinatlon of a source of water under high pressure, a distributor 

